handout_L17_Bonding - Lecture 17: Chemical Bonding Reading:...

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1 Lecture 17: Chemical Bonding • Reading: Zumdahl 13.1-13.3 • Outline – Types of Chemical Bonds – Electronegativity – Bond Polarity and Dipole Moments Chemical Bonds • In broad terms, a chemical bond is a term used to characterize an interaction between two atoms that results in a reduction in Gibbs free energy for the system relative to the isolated atoms. • The degree of energy reduction or “stabilization” is given by the energy required to break the bond (known as the “bond energy”) Chemical Bonds (cont.) Stabilization Chemical Bonds (cont.) • Prototypical bonding example: NaCl (Sodium Chloride) • When NaCl is heated to the point of melting, one can demonstrate that the resulting solution conducts electricity. • This observation demonstrates that the solution (liquid NaCl) contains charged species. Those species are Na + and Cl - . Chemical Bonds (cont.) • Why the formation of Na + and Cl - ? • In short, Na + and Cl - are more energetically stable than atomic Na and Cl. • With the transfer of an electron from Na to Cl, two ions of opposite charge are produced. The Coulombic attraction between these ions is largely responsible for
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This note was uploaded on 01/18/2012 for the course CHEM 152A taught by Professor Chiu during the Winter '12 term at University of Washington.

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handout_L17_Bonding - Lecture 17: Chemical Bonding Reading:...

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